Delavan, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Delavan is known for its scenic lakes and outdoor recreational activities. The best time to travel to Delavan, United States, is during the summer months of June to August, when the average air temperature is around 70-80°F and the water temperature in Delavan Lake is approximately 70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!